Friction-clutch.



N0. 780,580-, v vYA'I'ENTH) JUNE 9g 1903.

v y L. STANFORD@ n FR-IGTION LU''GL`V LIGATIOH rn. 2.- 190s.

UNITED STATES ARTHUR L. STANFORD,

Patented 3' une 9, 1903.

OF CHICAGO, ILLINOIS.

FRicTloN-CL-uTcl-i;Y

SPECIFICATION forming part of Letters Patent N0. 730,580, dated June 9, 1903. Appunti@ hairpin 2,1903. serai Nfl. 150,638. on mais.)

To @ZZ whom t may concern/.f

Be it known that I, ARTHUR LVSTANFORDY, a citizen of the United States, residing at Chil cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Friction-Clutches, of which the following is a full, clear, and exact speciication.

My invention relates more particularly to that class of friction-clutches comprising an oscillatory gripping ring or pawl binding the bar to be clutched on opposite sides; and my invention has for its primary object to provide improved means whereby the grippingfaces of thering may be equipped with hardened reinforces capable of renewal, if desired, so that when worn beyond usefulness they may be renewed, thus prolonging the life of the ring proper an indefinite length of time.

With these ends in view my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by whichthe said objects and certain i other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings'and more particularly pointed out in the'claims.

In the said drawings, Figure l is a plan view of my improved clutch. Fig. 2 is a vertical section thereof on the line2 2, Fig. I; and Fig. 3 is a vertical cross-section on the line 3 3, Fig.,l.

l is the bar to `be clutched or gripped and which in reality constitutes apart ofthe clutch, and 2 is the ring or the pawl, which is shown formed with a lever or handle 3 and through which ring passes the bar l.

In the inner faces of the ring 2, which is shown rectangular in cross-section, as appears in Fig. l, on diametrically-opposite sides are formed recesses 4 5, respectively, and in these recesses are inserted reinforce-blocks 6 7, respectively, which project preferably entirely across opposite faces of the bar l and also protrude from the recesses beyond the opposed faces of the ring 2 a sufficient distance to insure firm contactand 'an accurate fit against the bar in such a way that when the pawl' or ring is deiiected with relation to the bar the outer faces of the reinforce-blocks 6 7, which are fiat and substantially parallel, will bind against the sides of the bar and gripthe same with a pressure proportionate from direct wearing contact, and at the same Y time the blocks will be held in place by engagement with the bar and prevented from moving laterally a sufficient distance to become dislodged from their seats or recesses. The other dimension of the ring-i'. e., at right angles to that just described-is lsubstantially equal to the width of the bar, as

shown in Fig. l. c

In this example .of my invention I have' illustrated the clutch in a form suitable for supporting the bar l against downward movement. In such use the clutch lever or arm 3 would ordinarily be f ulcrumed or supported at about the point 8 on any suitable fulcrum or support, so that the tendency of the bar and clutch to move downwardly together will throw the blocks 6 7 against the opposite sides of the bar and cause them to bind. In this form the blocks 6 7 are set diagonally opposite each other, the block 6, which moves downwardly at a greater rate of speed than the block 7, being set lowerthan the latter.

In order that the reinforce-blocks 6 7 may vbe readily reset when worn beyond usefulness and it is desired to renew them, the ring 2 ou one side of each 4of the recesses 4 5 is cut away, as shown at 9 10, respectively, the recess 4 being cut away at the bottom and the recess 5 at the top or on the sides opposite that onwhich the strain is borne. Thus by removing the bar l and inserting an instrument in the notches 9 or l0 at the back of the block the latter may be forced out of its seat.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

recesses being each cut away on one side for the admission of a tool behind the block therein.

4. In a friction-clutch, the combination of a ring member having its inner faces recessed, reinforce-blocks set in said recesses, and a bar fitting between said blocks, one of said recesses being notched on its top side and the other on its bottom side for the admission of a tool behind the blocks therein.

ARTHUR L. STANFORD. Witnesses:

F. A. HOPKINS, M. B. ALLSTADT. 

